| 年度 | 实际值 |
|---|---|
| 1995 | 14.9 |
| 1996 | 16 |
| 1997 | 45.25 |
| 1998 | 18.9 |
| 1999 | 19.6 |
| 2000 | 15.4 |
| 2001 | 17.58 |
| 2002 | 18.9 |
| 2003 | 17.93 |
| 2004 | 19.17 |
| 2005 | 15.94 |
| 2006 | 15.64 |
| 2007 | 16.58 |
| 2008 | 15.64 |
| 2009 | |
| 2010 | 29.43 |
| 2011 | 25.86 |
| 2012 | 26.12 |
| 2013 | 28.1 |
| 2014 | 40.61 |
| 2015 | 45.2 |
| 2016 | 45.6 |
| 2017 | 45.04 |
| 2018 | 48.12 |